How to describe the improvement of the condition?

Have the following description:

1, recovery, refers to the condition began to improve, the body gradually returned to normal.

2, rehabilitation, refers to the improvement of the condition, the body gradually returned to a healthy state.

3. gradual improvement means that the condition gradually improves and the body gradually returns to health.

4. Rejuvenation means that the body gradually regains vitality and can move and work normally.